Flow Behavior of AISI 5140 Steel in Temperature Range of Warm- Hot Forging.

In this paper, the influence of flow stress models on FEM simulation results is discussed; the flow stress of AISI 5140 steel at different T, ε and ε in the temperature of warm-hot forging is measured by a uniaxial compression experiment with a thermomechannical simulator. The experimental results show that flow stress is very complex within the temperature range of warm-hot forging; and the traditional interpolation method adopted in FEM simulation on the basis of cold or hot flow stress models is not scientific. To improve FEM simulation precision, a flow stress mathematic model should be calibrated by experiment. Finally, the calibrated flow stress model of AISI 5140 steel is applied in the FEM simulation of the warmhot forging process of the splined shaft of an automobile. Comparison between the results of FEM simulation and the warm-hot forging experiment indicates that the flow stress model calibrated by experiment is scientific and effective. [ABSTRACT FROM AUTHOR]